[1]  Borges C R. On stratifiable spaces. Pacific J Math, 1966, 17: 1--16

[2]  Engelking R. General Topology (Revised and completed edition). Berlin: Heldermann Verlag, 1989

[3] Gartside P. Generalized Metric Spaces, I//Hart K P, Nagata J, Vaughan J V eds. Encyclopedia of General Topology. Amsterdam: Elsevier Science Publishers, 2004: 273--275

[4]  Good  C, Haynes L. Monotone versions of countable paracompactness. Topology Appl, 2007, 154: 734--740

[5]  Good C, Stares I. Monotone insertion of continuous functions. Topology Appl, 2000, 108: 91--104

[6]  Gruenhage G. Generalized Metric Spaces//Kunen K, Vaughan J E eds. Handbook of Set-theoretic Topology. Amsterdam: Elsevier Science Publishers, 1984: 423--501

[7]  Gruenhage G, Michael E A, Tanaka Y. Spaces determined by point-countable covers. Pacific J Math, 1984, 113: 303--332

[8]  Gutirrez A, Romaguers  S. On pairwise stratifiable space (in spanish). Rev Roumaine Math P Appl, 1986, 31: 141--150

[9]  Lane K,  Nyikos P,  Pan C. Continuous function characterizations of stratifiable space. Acta Math  Hungar, 2001, 92: 219--231

[10]  Li  K, Lin  S.  Notes on symmetric g-functions. Acta Math  Hungar, 2007, 116: 73--77

[11]  林寿. 广义度量空间与映射(第二版). 北京: 科学出版社, 2007

[12]  Lutzer D J. Semimetrizable and stratifiable spaces. General Topology Appl, 1971, 1: 43--48

[13]  Mack J.  Countable paracompact and weak normality properties. Trans Amer Math  Soc, 1970, 148: 265--272

[14]  Marin J,  Romaguera S. Pairwise monotonically normal spaces. Comment Math Univ Carolinae, 1991, 32: 567--579

[15] Morita  K, Nagata J. Topics in General Topology. Amsterdam: Elsevier Science Publishers, 1989

[16]  Yang E, Yan P. Function characterizations of semi-stratifiable spaces. J Math Research and Exposition, 2006, 26: 213--218